This should have roots 7 and 11. My problem is getting the second root x=11 by entering initial estimates of 9 and 20, using the procedure described in the HP-42S Owner's Manual, Chapter 12, section "Choosing Initial Guesses". I entered the following keys:

(Shift) (Solve) (Soft key for QUAD)

OK, now I'm in the solver for program QUAD. More keys:

(9) (Soft key for X)

which should store the low estimate for X. Now to store the high estimate:

(2) (0) (Soft key for X)

To solve for X:

(Soft key for X)

I get answer "X=9.0000" which is clearly not correct (should be 11). Did I do something wrong?